What are different file OPEN modes available in COBOL?
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In Sequential File Organization, File Opening Modes are
Output,I-O, input,extend.
In Indexed File Orgainsation, File Opening Modes are
Output,I-O, input
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Which of the following files can be OPENed in all the 4 modes? The four modes are INPUT, I-O, OUTPUT and EXTEND. (a) INDEXED (b) RELATIVE (c) SEQUENTIAL (d) All of the above
COBOL 
